package com.mmall.concurrency.example.lock;

import lombok.extern.slf4j.Slf4j;

import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * Created by Andrew on 2018/5/30.
 */
@Slf4j
public class LockExample3 {

    private final Map<String, Data> map = new TreeMap<>();
    private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    private final Lock readLock = lock.readLock();
    private final Lock writeLock = lock.writeLock();
    public Data get(String key){
        readLock.lock();
        try{
            return map.get(key);
        }finally{
            readLock.unlock();
        }
    }
    public Set<String> getAllKeys(){
        readLock.lock();
        try{
            return map.keySet();
        }finally{
            readLock.unlock();
        }
    }
    public Data put(String key, Data value){
        writeLock.lock();
        try{
            return map.put(key, value);
        }finally {
            writeLock.unlock();
        }
    }

    class Data{

    }
}
